This video, put together by the University of California in the late 1950s, has a straightforward agenda: explain how car crashes and seat belts work, and why wearing the latter helps you survive the former. The message resounds clearly to this day.
In the immediate postwar era, when automatic transmissions were still somewhat unusual and mysterious, the U.S. Army used its significant training skills to teach the troops about how spinning oil between two sets of paddles can move a truck.
Before they start making you drive a forklift at your factory job, watch this video. Otherwise you might not know how you're about to brutally murder all of your coworkers. As usual, it's the hard-nosed Germans to the rescue in this ironically NSFW video.